The study was carried out in the high Andean region of Ecuador using the National collection of Melloco (Ullucus tuberosus C.), which belongs to the National Germplasm Bank of INIAP. The objective was to evaluate the characteristics of the collection sites, identify climatic ranges and favorable or marginal ecosystems for cultivation. For the characterization, georeferential information of collection points and other climatic, geophysical and edaphic variables were used. An Eco-geographic Characterization Map of the specific Land (ELC map) was generated applying the tool CAPFITOGEN and descriptive statistics. As results, categories that establish the adaptive ranges in the crop were identified, with 22 categories defined by the ELC map. 39% (73) of the accessions were collected in the categories with temperature ranges from 11ºC to 13ºC, low content of organic matter, slope slightly inclined, sandy loam soil, shallow and a pH moderately acidic. The environmental variables for the most frequent categories presented average values of temperature between 5 – 20ºC, a precipitation that oscillates between 379 – 3764 mm, with an altitude range between 1800 – 3800 masl, slope of 8 – 9º and pH of 5.7. The eco – graphical characterization maps were useful to identify suitable areas for melloco and other Andean tubers in Ecuador, and to know the eco – geographic ranges for the studied crop.